KA3525AN LINEAR INTEGRATED CIRCUIT REGULATOR PULSE WIDTH MODULATOR The KA3525A is a monolithic integrated circuit that included all of the control circuit necessary for a pulse width modulating regulator. There are a voltage reference, an error amplifier, a pulse width modulator, an oscillator, under-voltage lockout, soft start circuit, and output drivers in the chip. FEATURES * 5V+1% Reference Oscillator Sync Terminal * Internal Soft Start * Deadtime Control * Under-Voltage Lockout BLOCK DIAGRAM ORDERING INFORMATION Device Package Operating Temperature KA3525AN 16 DIP Q~ +70C ver G6) _ Veo BAND GAP 5} REF SV U.V.L.O. GND O3 > eai-) @}_>> AMP anQf EA OUT @)- aN M (Sorr ) START) LATCH COMP, =|: OSCILLATOR FIF SAUT DOWN (0) & SAMSUNG Electronics 347 KA3525AN ABSOLUTE MAXIMUM RATINGS LINEAR INTEGRATED CIRCUIT Characteristic Symbol Value Unit Power Supply Valtage Voc | 40 Vv t Collector Supply Voltage Ve \ 40 Vv Output Current, Sink or Source lo 500 mA Reference Output Current ler 50 mA Oscillator Charging Current | lenarge 5 mA Power Dissipation Po 1000 mw Cd Operating Temperature - Topr O~ +70 C Storage Temperature Tstg -65~ +150 C Lead Temperature (Soldering, 10 sec) Tiead - +300 C ELECTRICAL CHARACTERISTICS (Vcc = 20V, 0< Ta< 70C, unless otherwise specified) | Characteristic Symbol Test Condition Min Typ Max : Unit REFERENCE SECTION Reference Output Voltage Vrer Tj= 25C 50 | 61 | 52 | Vv | | Line Regulation AVrer Veco =8 to 35V | 9 20 mV Load Regulation AVeer | t=O to 20mA | 20 | 50 | mv Short Circuit Current Isc Veer =0, Tj) = 25C 80 100 mA Total Output Variation (Note 1) AVner Line, Load and Temperature 4.95 5.25 v | Temperature Stability (Note 1) | AVaer/AT - 20 | 50 | mv iE Long Term Stability (Note 1) TL T,=125C, 1 KHrs _ 20 | 50 _ mV | OSCILLATOR SECTION: | Initial Accuracy (Note 1, 2) ] T,=25C +3 +6 | % | Voltage Stability (Note 1, 2) AlAVec | Veo =8 to 35V +08 | 42 | m | Maximum Frequency ] fax Ry =2K0, Cr =470pF 400 430 KHz Minimum Frequency fain Rr= 200Ka, Cr=0.1 nF 60 120 Hz Clock Amplitude (Note 1, 2 7 - 3 4 V | Clock Width (Note 1,2) Tj=25C fos | 06 | 1 | as | Sync Threshold 1.2 2 2.8 Vj "Sync input Curent. | Syn = BBV 13. | 25 | mA 348 & SANSUNG Electronics KA3525AN LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS (Vcc = 20V, 0<Ta< 70C, unless otherwise specified) Characteristic Symbol Test Condition Min Typ Max Unit ERROR AMPLIFIER SECTION (Vow =5.1V) Input Offset Voltage Vio 1.5 10 mV Input Bias Current lie 1 10 pA Input Offset Current : lio 0.1 1 pA DC Open Loop Gain Avo R= 10Mo 60 | 80 dB Common Mode Rejection Ratio | CMRR | Vcw=1.5 to 5.2V 60 | 90 dB Power Supply Rejection Ratio PSRR | Voc =8 to 3.5V 50 60 dB PWM COMPARATOR SECTION - Minimum Duty Cycle Din 0 % "Maximum Duty Cycle ~=~S*~*~S~C*~i ia ST | 49 % Input Threshald Voltage (Note 2) Vout Zero Duty Cycle 0.7 0.9 v input Threshold Voltage (Note 2) Vine Max Duty Cycle 3.2 3.6 Vv | SOFT-START SECTION : Soft Start Current Ist Vso = OV, Veg = OV 25 | (54 go | yA "Soft Start Low Level Voltage | Vso = 25V 03 | a7 | v Shutdown Threshold Voltage Thsp : - 0.6 0.8 1 Vv Shutdown Input Current a Vsp=2.5V 0.3 1 mA | QUTPUTSECTION =t Low Output Voltage | Vout Isink = 2ZOMA 0.1 0.4 Vv ~ Low Output Voltage Il Vor i lank = 100MA 0.05 | 2 V High Output Voltage | - Vout - source = 2OMA 18 19 Vv High Output Voltage !I Vow leource = 100A 17 | 18 V Under Voltage Lockout Muy Vs and Ve =High 6 7 8 v "Collector Leakage Current lec. Veo 35V so | 200 | yA Rise Time (Note 1) | T,. | _Gi= taf, T= 25C so | 600 | nS Fall Time (Note 1) T | C.=1pF, T,= 25C 70 300 ns STANDBY CURRENT Supply Curent =| ds | (Vee = 8 | | 12 | 20 | ma (Note) 1. These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production 2. Tested at fose = 40 KHz (R7 =3.6K, Cr =0.01nF, Rp = 00) & SAMSUNG Electronics 349